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n in (-oo:+oo)
n/(-6) = 4/7 // - 4/7
n/(-6)-(4/7) = 0
n/(-6)-4/7 = 0
-1/6*n-4/7 = 0 // + 4/7
-1/6*n = 4/7 // : -1/6
n = 4/7/(-1/6)
n = -24/7
n = -24/7
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